Shelf unit



FIG. 1 is a Front Isometric view of the shelf unit;

FIG. 2 is a Top View of the shelf unit;

FIG. 3 is a Bottom View of the shelf unit;

FIG. 4 is a Front View of the shelf unit;

FIG. 5 is a Rear View of the shelf unit;

FIG. 6 is a Right View of the shelf unit; and,

FIG. 7 is a Left View of the shelf unit. 

CLAIM The ornamental design for shelf unit, as shown and described. 